How to prevent Yosemite going to suspend state when MBPr is on power and display is o

[striders]

Under System Preferences -> Energy Saver -> Power Adapter, there is an option for

"Prevent computer from sleeping automatically when the display is off"

However, such option is NOT available in "Battery". The problem is, when I am using battery on my MBPr (unplugged from power), when the display if automatically turned off, the machine always go to Suspend state. This will "kill" whatever process I am running.

Is there a way to prevent this from happening? I recall in Maverick this behavior did not happen.

 

[striders]

Found a link about this: apparently it has to be set form Terminal by using the "sudo pmset" command.

I tried to set the "Sleep" state to 60 minutes while leaving the display sleep to 5 minutes (from System Preferences), but I got this warning:

$ sudo pmset -b sleep 60
Password:
Warning: Idle sleep timings for "Battery Power" may not behave as expected.
- Disk sleep should be non-zero whenever system sleep is non-zero.

I assume "Disk Sleep" here is equal to "Put Hard Disk to sleep when possible" in System Preferences, which is already UNCHECKED prior to running the above pmset command.

Am I missing something here?

 

[randomgeeza]

Found a link about this: apparently it has to be set form Terminal by using the "sudo pmset" command.

I tried to set the "Sleep" state to 60 minutes while leaving the display sleep to 5 minutes (from System Preferences), but I got this warning:

$ sudo pmset -b sleep 60
Password:
Warning: Idle sleep timings for "Battery Power" may not behave as expected.
- Disk sleep should be non-zero whenever system sleep is non-zero.

I assume "Disk Sleep" here is equal to "Put Hard Disk to sleep when possible" in System Preferences, which is already UNCHECKED prior to running the above pmset command.

Am I missing something here?

Reset your Energy Saving properties in System Prefs to default. Apply the Terminal command and then re-adjust the Energy Saving settings, back to your own liking.

You can then check the state of the system using pmset -g in Terminal.

 

[striders]

Reset your Energy Saving properties in System Prefs to default. Apply the Terminal command and then re-adjust the Energy Saving settings, back to your own liking.

You can then check the state of the system using pmset -g in Terminal.

I run pmset -g and got this:

Active Profiles:
Battery Power		-1*
AC Power		-1
Currently in use:
 standbydelay         10800
 standby              1
 halfdim              1
 hibernatefile        /var/vm/sleepimage
 darkwakes            0
 disksleep            0
 sleep                60 (sleep prevented by backupd)
 autopoweroffdelay    14400
 hibernatemode        3
 autopoweroff         1
 ttyskeepawake        1
 displaysleep         5
 acwake               0
 lidwake              1

For "sleep 60", I wonder what it means by "sleep prevented by backupd".

So far my changes seems to work under battery power: screen goes to sleep, MBPr still on (I can ping, remote connect, etc.)
2

 

[randomgeeza]

The backupd process is Time Machine. So, it is advising that Time Machine will prevent the unit from sleeping (if running) I presume.

You might find this interesting also, and it may help you understand the pmset command...

http://en.wikipedia.org/wiki/Pmset

 

[striders]

Thank you!